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+# Ceph - a scalable distributed storage system
+
+Please see http://ceph.com/ for current info.
+
+
+## Contributing Code
+
+Most of Ceph is licensed under the LGPL version 2.1.  Some
+miscellaneous code is under BSD-style license or is public domain.
+The documentation is licensed under Creative Commons
+Attribution-ShareAlike (CC BY-SA).  There are a handful of headers
+included here that are licensed under the GPL.  Please see the file
+COPYING for a full inventory of licenses by file.
+
+Code contributions must include a valid "Signed-off-by" acknowledging
+the license for the modified or contributed file.  Please see the file
+SubmittingPatches.rst for details on what that means and on how to
+generate and submit patches.
+
+We do not require assignment of copyright to contribute code; code is
+contributed under the terms of the applicable license.
+
+
+## Checking out the source
+
+You can clone from github with
+
+	git clone git@github.com:ceph/ceph
+
+or, if you are not a github user,
+
+	git clone git://github.com/ceph/ceph
+
+Ceph contains many git submodules that need to be checked out with
+
+	git submodule update --init --recursive
+
+
+## Build Prerequisites
+
+The list of Debian or RPM packages dependencies can be installed with:
+
+	./install-deps.sh
+
+
+## Building Ceph
+
+Note that these instructions are meant for developers who are
+compiling the code for development and testing.  To build binaries
+suitable for installation we recommend you build deb or rpm packages,
+or refer to the `ceph.spec.in` or `debian/rules` to see which
+configuration options are specified for production builds.
+
+Prerequisite: CMake 2.8.11
+
+Build instructions:
+
+	./do_cmake.sh
+	cd build
+	make
+
+This assumes you make your build dir a subdirectory of the ceph.git
+checkout. If you put it elsewhere, just replace `..` in do_cmake.sh with a
+correct path to the checkout.
+
+To build only certain targets use:
+
+        make [target name]
+
+To install:
+
+        make install
+ 
+### CMake Options
+
+If you run the `cmake` command by hand, there are many options you can
+set with "-D". For example the option to build the RADOS Gateway is
+defaulted to ON. To build without the RADOS Gateway:
+
+        cmake -DWITH_RADOSGW=OFF [path to top level ceph directory]
+
+Another example below is building with debugging and alternate locations 
+for a couple of external dependencies:
+
+        cmake -DLEVELDB_PREFIX="/opt/hyperleveldb" -DOFED_PREFIX="/opt/ofed" \
+        -DCMAKE_INSTALL_PREFIX=/opt/accelio -DCMAKE_C_FLAGS="-O0 -g3 -gdwarf-4" \
+        ..
+
+To view an exhaustive list of -D options, you can invoke `cmake` with:
+
+        cmake -LH
+
+If you often pipe `make` to `less` and would like to maintain the
+diagnostic colors for errors and warnings (and if your compiler
+supports it), you can invoke `cmake` with:
+
+        cmake -DDIAGNOSTICS_COLOR=always ..
+
+Then you'll get the diagnostic colors when you execute:
+
+        make | less -R
+
+Other available values for 'DIAGNOSTICS_COLOR' are 'auto' (default) and
+'never'.
+
+
+## Building a source tarball
+
+To build a complete source tarball with everything needed to build from
+source and/or build a (deb or rpm) package, run
+
+	./make-dist
+
+This will create a tarball like ceph-$version.tar.bz2 from git.
+(Ensure that any changes you want to include in your working directory
+are committed to git.)
+
+
+## Running a test cluster
+
+To run a functional test cluster,
+
+	cd build
+	make vstart        # builds just enough to run vstart
+	../src/vstart.sh -d -n -x -l
+	./bin/ceph -s
+
+Almost all of the usual commands are available in the bin/ directory.
+For example,
+
+	./bin/rados -p rbd bench 30 write
+	./bin/rbd create foo --size 1000
+
+To shut down the test cluster,
+
+	../src/stop.sh
+
+To start or stop individual daemons, the sysvinit script can be used:
+
+	./bin/init-ceph restart osd.0
+	./bin/init-ceph stop
+
+
+## Running unit tests
+
+To build and run all tests (in parallel using all processors), use `ctest`:
+
+	cd build
+	make
+	ctest -j$(nproc)
+
+(Note: Many targets built from src/test are not run using `ctest`.
+Targets starting with "unittest" are run in `make check` and thus can
+be run with `ctest`. Targets starting with "ceph_test" can not, and should
+be run by hand.)
+
+When failures occur, look in build/Testing/Temporary for logs.
+
+To build and run all tests and their dependencies without other
+unnecessary targets in Ceph:
+
+        cd build
+        make check -j$(nproc)
+
+To run an individual test manually, run `ctest` with -R (regex matching):
+
+	ctest -R [regex matching test name(s)]
+
+(Note: `ctest` does not build the test it's running or the dependencies needed
+to run it)
+
+To run an individual test manually and see all the tests output, run
+`ctest` with the -V (verbose) flag:
+
+	ctest -V -R [regex matching test name(s)]
+
+To run an tests manually and run the jobs in parallel, run `ctest` with 
+the `-j` flag:
+
+	ctest -j [number of jobs]
+
+There are many other flags you can give `ctest` for better control
+over manual test execution. To view these options run:
+
+	man ctest
+
+
+## Building the Documentation
+
+### Prerequisites
+
+The list of package dependencies for building the documentation can be
+found in `doc_deps.deb.txt`:
+
+	sudo apt-get install `cat doc_deps.deb.txt`
+
+### Building the Documentation
+
+To build the documentation, ensure that you are in the top-level
+`/ceph` directory, and execute the build script. For example:
+
+	admin/build-doc
+